Benjamin/Cummings, 1999 - Science - 620 pages
This coherent text translates the methods of statisticians into "ecological English" so that students may readily apply these methods to the real world. Ecological Methodology, Second Edition provides a balance of material on animal and plant populations. It teaches students of ecology how to design the most efficient tests in order to obtain maximum precision with minimal work. The first part of the text focuses on biological and technical issues in statistical methodology. Students learn about advances that have been made in designing better sampling devices, along with the techniques and equipment used for sampling. The second part deals with creating solid statistical design, and presents all methods that are well-known to statisticians in a language and context that students will easily understand.
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Stratum A has about ten times the density of Stratum C. many ecological
examples, stratification is done on the basis of geographical area, and the sizes
of the strata are easily found in m” or km”, for example. There is no need for the
strata to ...
where N, = Size of stratum h (number of possible sample units in stratum h) N =
Size of entire statistical population The stratum weights are proportions and must
add up to 1.0 (Table 8.3). Note that the No. must be expressed in sample units.
where WA = Stratum weight (equation (8.15]) s? = Observed variance of stratum
h (equation [8.3]) na = Sample size in stratum h f, - Sampling fraction in stratum h
= n/NA The last term in this summation is the finite population correction, and it ...